Halogenated 2.3-naphthisatins.



Cir

parts being by weightz-- New U it lime/' #3 ii l5 we. liveliest orment/a.

WILHELM BAUER; OF VOHVVINKEL,

ANB ALFRED JQND RUDGEJIE MAYER,ZOF

ELBERFELI), GERMANY, ASSIGNORS TO EAEBENFABRIKEN FRIEDR. BAYEBI I 5 60., OF ELBER-FELD, GER-MANY; A CORIFORATIO'N 0E GEEMENY.

HALOGENATED ELBJWA'EHTEHSAYINS,

Speeifieationof Letters Fatent.

essors.

N0 Drawing.

duction of new and valuable halogenated- 2.3naphthisatins of the general Io-rrnula:

(B being a napththalene ring containing at least one halogenatom in 1 position and the Nil of the isatin ring in 2 position, the C0 of the isatin ring in position) which can be used for the production of valuable vat dyestuffs. they are red crystalline pow-- clers erystallizing from organic solvents in red crystals and which can be converted by treztuient with PCL, into an aleha-chlorid.

The new halogenated naphthisatins are produced. by treating; alpha-alpha-clihalogen beta hydrocyanocarholiinophthylimid with mihydrous aluminium chlorid and by seponi'l ving the resulting intermediate products.

In order to illustrate the new process more fully the following examples are given, the

Example A; 390 parts of alphzr-alplnudh chloro beta hytlrocyaiiocarboclinaphthyli- .rnid (Mp1 201 C.) havingniost probably the formula which is obtained by treating with chlorin Patented. Jan. h. it 9114;.

Application filed June 30, 3.913. Serial No. 776,539.

bluish-black. After sei erel hours stirring it is poured into ice Water and the benzene is removed: by distillation with steam. The intermecliate compound thus obtained being most probably the alpha-1-chloronaphthalie of the l-cli loro-2.3 -naphthisatin:

cr v stellizes from nitrobenz'ene in brown needles melting at 280 (1, soluble in organic solvents with a. reel-violet, in concentrated sulfuric acid with a reddish-brown color. By boiling with dilute acids it is converted into the 1-dbloro-Qfimaphthisatin;

cos-

which can be purified by solution in bisullites and reprecipitetion from the bisulfite solution. It forms a brick-reel crystalline powder, crystallizing from organic solvents in red-needles melting" it 258:259" C. By treatment with PCL, it, is convertecl'into an alpha-chloricl which can be combined with suitable components to indigoid coloring inatters. I

Example B: 1bromO-Q-naphthylamin is (converted into the 1.1 dibroi'no 2.2 (linaphthylthiouree according to the method described by Braun (Ber. 39 page 4 3) by stirring the 1-bromo 2-naphthylamii1 for several days with the calculated quantities of carhon-disulfid end a 3 per cent. hydrogen peroxicl. .Thethiourea crystallizes in the shape of-white leaflets melting at 180 C. It is then converted into the 1.1-dibron10-hydroeyenorerbo-heta -loeta-dinaphthyliniitl by treatment with carbonate of lead and eyanicl of potassium (see German Letters latent 15201.9)... lit crystallizes from benzene in the shape'oif yellow needles melting at 204 C. 480 parts of the dibromohy- C1rocyanocarbodinaphthylimid are mixed with 159,0 parts of benzene. 350-400perts of anhydrous aluminium chlorid are then slowly added to this mixture While it is bedl'es melting at 256 g Halogen or halogenizing agents convert the may iszttins into products containing more halogen.

Example Or To a suspension of 231 parts oi 1-ehloro-2.3-neplithisotin in 125 parts of ohlorohenzene 1&0 parts of 80 01 are added. The mixture is slowly heated Within 5 hours to T C. and kept at 70 C. for 3 hours While the mixture is being-Well stirred. After cooling the product is filtered off, washed I We claim: I

-1. The herein described halogenated 2.3-

Which is o. brick-red crystalline powder crystallizing from organic solvents in red needles melting at 258-.59" C. and which is converted by treatment with P01 into an alphmchlorid which can be combined with suitable components to indigoid coloring nm't-ters.

In testimony whereof we have hereunto 1 ing Well stirred and the mixture is heated to naphthisatins having most probably the on 40 3035' (1. it turns bluish-black. After sevmuhr:

'eral hours stirring it is poured into ice Water and then' benzene is removed by distillag tion with steam. 'lheiintermediate com- Pound thus Pill/{lined is l P y the which are red crystalline powders. erysteh ill])llUri-b1 011]Onaphthalld of tile l-bIOIIlO- lizino 01 rging olvents in red rystals 2. 5;mphthisatin. It crystallizes from nitroand bwhich be 'convfirted by treatment f lurk Violet needles ll g a m with P61 into an alpha chlorid substan talhc luster. M. P. 254 C. By dissolving tinny as describei it in 1090 times its quantity of cold sulgf fh he i d ib d 1 1 ..g 3 fl ll'lc IQ-id POllI'lng into ice Water and naphthisatin of the, for nul'a:

heating the mixture to boiling until it has 02 assumed a red coloration the saponification n is complete. The l-bromo-2.3nophthisatin R can be purified by solution in bisulfites and I l reprecipitstion from the hisulfite solution. -oo It crystallizes fromnitrobenzene in red nee set our hands in' the presence of two subscribing witnesses.

and dried. It is a red crystalline powder WILHELM BAUER. [1 s] melting at 258-250 C. By treating the 1- ALFRED l-IEBRE. the] ehloro-2.8-1mphthisatin in nitrobenzene sus- RUB-031.41 MAYER. [n s] --pension with one molecule of brolnin at C. the hromo 1-chlor0-23-na.phthis2itin is obtained melting at 313 C.

/Vitnesses b HELEN Norm, ALBERT NUFER.

It is hereby certified thtitin Letters Patent No. 1,083,518, granted January 6, 1914;, upon the application of Wilhelm Bauer. of Vohwinlzel, and'Altred Herr-e Rudolf Mayer, of Elberfeld, Germany, for an improven'ient in *llelogenated 2.3 Naphthisatins, an error appears in the hrintedspecilieation requiring correction as follower Page 2, line 32, statement of temperature, for 2584250? C." reed 2584259 and that the said letters Patent should be read with this correction therein that the seine may conform to the record of the case in the Patent Ofice.

Signedhand sealed this 2-lth day of February, A. D-., 1914-.

[siren] J. T. NEWTON,

biotin-5i Govnmissioner of Patents.

Correction in Letters Patent tie. t,383,5 

